Examine source code of Winter

{
  "name": "Winter.1",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Winter.1.jpeg"
    },
    "colors": {
      "toolbar": "rgba(89, 96, 117, 1)",
      "toolbar_field": "rgba(214, 217, 232, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "frame": "rgba(209, 209, 209, 1)",
      "tab_background_text": "rgba(201, 201, 201, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)"
    }
  }
}